Gwen Carr said de Blasio would lose her vote if he didn’t prioritize police reforms. (Jefferson Siegel/New York Daily News)

Eric Garner's mother is fed up with Mayor de Blasio — and open to another candidate for mayor.

Gwen Carr, speaking at a rally for police reform on the eve of the two-year anniversary of a grand jury's decision not to indict the cop who killed her son, said she wants to see the mayor back a bill that would make chokeholds illegal.

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Using chokeholds as a tool to subdue suspects is prohibited by the NYPD, but the bill would go one step further by making it a criminal act.

Supporters say if that bill was a law it would make it easier to prosecute cops who do use it.

Carr said the bill could have helped lead to criminal charges against the cop who used a chokehold on her son.

"It can't help my son now but it can maybe help your son, or your nephew or your grandson," Carr said at the rally.

Using chokeholds as a tool to subdue is prohibited by the NYPD, but not illegal.

Afterward, she said she would consider another candidate for mayor if de Blasio doesn't push for more NYPD reforms.

"I like de Blasio, I voted for him before," she said. "But he has to be in sync with me if he wants my vote. If he doesn't, I'll make a decision at the time."

She's not alone.

The rally included many disgruntled allies of the mayor, including leaders in the Rev. Al Sharpton's National Action Network and members of the City Council's Progressive Caucus.

All had pushed for de Blasio's election to City Hall in 2013.

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"Transparency and accountability was a hallmark of the campaign that Bill de Blasio ran to become mayor of the city of New York," said Kirsten John Foy, the network's northeast regional director.

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"But what we have seen is not an effort to move toward greater transparency and greater accountability."

The Rev. Johnnie Green of Harlem said the mayor shouldn't take the black vote — which he received overwhelmingly in 2013 — for granted.

"If we cannot count on you now, you cannot count on us at the polls in 2017," said Green.

Newly elected Brooklyn State Sen. Marisol Alcantara, who volunteered for the de Blasio 2013 campaign, took it one step further.

Minister Kirsten Foy of the National Action Network said de Blasio hasn’t made good on his campaign promise of transparency. (Jefferson Siegel/New York Daily News)

She said the mayor's failure to support the chokehold bill was an example of "white privilege" because he wasn't taking the issue seriously. "How many more black and brown men have to be killed?"

The advocates also want de Blasio to fire the cop who killed Garner, 43.

Police Officer Daniel Pantaleo put the fatal chokehold on Garner while trying to arrest him for selling loose cigarettes, a minor offense.

The city has said they won't decide on the fate of Pantaleo's job until the FBI officially ends its investigation into Garner's death.

The News reported in October that federal prosecutors in Brooklyn had decided there wasn't enough evidence to charge Pantaleo federally. In a highly unusual move, the Justice Department — headed by former Brooklyn U.S. Attorney Loretta Lynch — then took over the probe.

The administration says the NYPD ban is enough.

"Criminalizing the maneuver is an unnecessary measure that would put officers in serious danger if confronted with a life and death situation where the move may be an officer's only line of defense," said Austin Finan, the mayor's spokesman.